Your soul is going wild because you're confused. If you're confused, it's usually because you don't know what's going on or what to do. This makes the soul inside your body go absolutely wild!
Whenever you're confused, こういち appears to offer you guidance. He's confused a lot, so he knows how to help. And knowledge offered by こういち is the best medicine for confusion.
Currently there are no similar looking kanji which exist in the WaniKani learning system